Hydrocarbon constituents thereof



c. c. BUSTSEY. APPARATUS FOR TREATING CARBONACEOUS MATERIAL FOR THE RECOVERY OF THE VOLATILE HYDROCARBON CONSTITUENTS THEREOF.

APPLICATION FILED APR.l0| l918- Patented Oct. 17, 1922.

4 SHEETS-SHEET 1.

C. C. BUSSEY. APPARATUS FOR TREATING CARBONACEOUS MATERIAL FOR THE RECOVERY OF THE VOLATILE HYDROCARBON CONSTITUENTS THEREOF.

APPLICATION FILED APR. I0, 1918.

1 ,432,275 Patented Oct. 17, 1922.

4 SHEETSSHEET 2.

Jaw/afar C. C. BUSSEY. APPARATUS FOR TREATING CARBONACEQUS MATERIAL FOR THE RECOVERY OF THE VOLATILE HYDROCARBUN CONSTITUENTS THEREOF.

APPLICATION FILED APR. 10 I918.

Patented Oct. 17, 1922.

4 SHEETSSHEET 3.

c. c. BUSSEY. APPARATUS FOR TREATING CARBONACEOUS MATERIAL FOR THE RECOVERY OF THE VOLATILE HYDROCARBON CONSTITUENTS THEREOF.

APPLICATION FILED APR. 10, 191a.

1,432,275 7 Patented Oct. 17, 1922.

Patented Oct. 17, 1922.

UNITED STATES CHARLES C. BUSSEY, 0F BROOKLYN, NEN YORK, ASSIGNOR TO SAMUEL E. DARBY TRUS'JJTfiE, OF NEW YORK. N. Y.

PATENT OFFICE.

APPARATUS FOR TREATING CARBONACEOUS MATERIAL FOR THE RECOVERY OF- THE VOLATILE HYDROCARBON Application filed April 10,

T0 (til whom it may concern:

Be it known that I, CHnnLE-s C BUssEY, a citizen of the United States, and resident of Brooklyn, county of Kings, State of New York, have made a certain new and useful Invention inApparatus for Treating carbonaceous Material for the Recovery, of the Volatile Hydrocarbon Constituents Thereof, of which the following is a specification.

This invention relates to apparatus for treating carbonaceous material for the recovery of the volatile hydrocarbon constituents thereof.

The object of the invention is to provide a simple, efficient, practical and economical apparatus for treating carbonaceous material such as coal, shale, lignite, or the like, for the recovery of the volatile hydrocarbon constituents thereof.

The invention, consists substantially in the construction, combination, location and relative arrangement of parts, all as will be more fully hereinafter set forth as shown in the accompanying drawings and finally pointed out in the appended claims.

One of the difiiculties heretofore experienced in commercial practice, in the treatment of carbonaceous material for the recovery of the hydrocarbon constituents thereof, is the inability to handle and operate that character, quality and grade of carbonaceous material which contains the higher volatiles because of the tendency of such material, while in the process of treatment, to bridge or agglomerate into a solid or solidified slag-like mass within the heating chamber in which the treatment is carried on. Such bridging or agglomeration prevents the efiective passage of air or gas through the mass. Various expedients have been resorted to, in practice, in the attempt to overcome this objection. According to one proposed plan the carbonaceous material is treated in comparatively small quantities and in thin layers. This has not proved to be satisfactory. Other expedients have also been attempted, in the efi'ortto overcome or remove the difiiculty, and to prevent or minimize the effect of the formation of such masses, but without substantial success so CONSTITUEN'IS THEREOF.

1918. Serial No. 227,672.

' under treatment, particularly in the apparaates or solidifies or forms into aslag-like condition of hard solid material which bridges across the extraction chamber, prevents the effective passage of air or gas through the mass of material under treatment, and clogs andarrests the extraction action. This in commercial practice has proved to be a source of serious difiiculty and has resulted in preventing the effective recovery of the volatiles from that class of carbonaceous material known as the higher volatile material, such for example, as cannel coal, and has prevented the use of such higher volatile material for extraction purposes.

For brevity of description I will hereinafter refer to the raw material to be treated as coal, intending, however, to include thereby any suitable carbonaceous material such as coal, shale, lignite, or the like; and by higher volatile coal I desire to include coal of that quality and grade which contains, say, from forty-five per cent upwards of volatile hydrocarbons. I desire, however, to reserve a fairmeasure of latitude as to the lower limit of percentage of volatiles as this factor varies with different grades of coal ordinarily referred to as the higher volatile coal.

Tn commercial practice as heretofore most generally carried out the treatment of coal for the recovery and extraction of the volatile constituents thereof has been for the most part confined to the lower volatile class of coal, although many efforts have been made, and apparatus proposed, to effect commercially the recovery and extraction of the volatiles from coal of the higher volatile class, but without any substantial commercial success.

Moreover, while it has long been sought to effect the treatment of coal for the recovery of the volatiles contained therein by the use of low temperatures, practical commercial success has not attended the efforts made in this direction, and the use of apparatus proposed therefor has not proved satisfactory, economical nor efficient. In the practical commercial apparatus very high temperatures have been heretofore ordinarily employed and required. These temperatures run usually around 2000 F., more or less. When the volatiles contained in carbonaceous material are subjected to such high temperatures chemical changes take place. in the extracted volatiles or distillates resulting in the production of less valuable products, such as coal tar and other products, which differ chemically from the more valuable extracted products such as crude oil and derivatives therefrom. This is true even when the coal of the lower volatile class is employed. In other words, according to the apparatus heretofore used commercially, and which have been the most successful, high temperatures are employed in the extracting or distilling operation, resulting in the production of a larger percentage of coal tar and a correspondingly smaller percentage of the more valuable crude oil product and its derivatives.

Because of the high temperatures ordinarily required in the extraction operation, according to the apparatus heretofore most generally used in commercial practice, it has been found impractical to use large units capable of handling large quantities of coal; difficulties have resulted due to mechanical stresses and strains developed in the feeding and delivery devices employed and required for the material under treatment; the cost of construction, installation and upkeep of the apparatus has been very large; much valuable time has been consumed in shutting down the furnaces for repairs, for recharging and discharge; and expensive and complicated quenching devices frequently have been required for quenching the mass of discharged product due to the ignition thereof upon being exposed to the oxygen of the outer air.

For these and other practical reasons the units heretofore employed have been limited in size and capacity, and hence the daily quantity of material handled has been thereby materially prescribed and the output'of recovered products limited, thereby enormously increasing the operating costs.

It is among the special. purposes of my present invention to avoid these and other difficulties and to provide an apparatus for treating carbonaceous material, whether of the higher volatile class orof the lower volatile class, for the extraction and recovery of the volatile constituents thereof, which is simple, practical, eflicient and economical.

In carrying out my present invention I propose to employ maximum extracting temperatures of approximately 800 F. instead of the higher temperatures, 2000 F., more or less, heretofore found to be necessary in commercial practice.

I propose in accordance with my invention to employ the body of material to be treated as a source of heat by forming a fuel bed at the bottom of the mass of material, and maintaining the bottom portion of the fuel bed in a state of combustion, and causing the heated products of combustion from the lower portion of the fuel bed to be passed through the superposed fuel bed and mass of material. I also propose to remove the residue of the fuel from the bottom of the fuel bed and at the same time supply material from the superposed fuel bed to take the place of the removed residue, and supply fresh raw material to the top of the pile of material superposed on the fuel bed. By suitably regulating and controlling the heat generation and the passage of the heated gases and vapors through the mass, the materialis subjected, during its progression, to anincreasing temperature from the point of its admission to the chamber where the treatment is carried out to the point where the maximum extracting heat is attained, at which point the extracting action is completed. The volatiles driven off from the mass of material under treatment at the various temperature zones are withdrawn together andsubjected t0 the various stages of condensation and refinement required for the purpose of collecting and recovering the values. In other words I propose in accordance wit-h my invention, to provide means whereby a fuel bed is formed at the bottom or base of a stack or pile of material to bev treated, such fuel bed being formed out of the material itself, after the extracting action thereon has been completed, which fuel bed supports and carries the weight of the superposed stack or pile of the material. the fuel residue being ejected or removed from the bottom of the fuel bed and coincidently fresh material being supplied from the top as the mass progresses through the various stages of treatment.

I also propose in accordance with my in vention, to provide means to carry on the extracting and recovery operation continuously, and, to this end, to withdraw the vapors as the volatiles are driven off from the material, and to maintain the mass of material under treatment in continuous progression, thereby preventing the formation of bridges or agglomerated or solidified masses within the body of the material under treatment. I also propose, in accord ance with my invention, to effect the extraction and recovery of the crude oil content of the coal insteadof coal tar oils. to say, by effecting the extraction of volatiles at temperatures below the cracking temperatures of oil the recovery of the volatiles of the coal is accomplished with the That is least possible chemical change therein through the heat to which they are subjected in the extraction and recovery operation.

'I alsopropbse,'in accordance with my invention,*to provide a structure having a large daily capacity per unit of the material handled, thereby vastly increasing the amount of extracted products obtainable per unit. I also provide a structure,the initial cost of construction and installation of Which, and the cost of maintenance, upkeep and repair, are enormously reduced, and wherein a greatly increased percentage of the crude oil volatiles of the higher commercial values are recovered even when employing the lower volatile coals, and wherein a higher volatile coal may be extracted with equal facility as in the case of lower volatile coal,'a result which has not heretofore been successfully accomplished com merciall'y.

I havefoundthat I am, enabled to accomplish my obj cots andpurposes by employing means for subjecting allthe material. under treatment, at all "points in any" plane transverse'or normal to the line'of feed or' progression thereof, toa uniform degree of temperature at. any: given instan'tof time; for subjecting all particles of the material in such a planeat an given instant of time to the same extent (if-extracting action; for subjecting all parts of the mass under treat- 'ment in the same plane a given instant of time to. a substantlally uniform degree of pressure and progression; for maintaining a substantially uniform degree of heat generation in the fuel bed employed at all-times in anygiventransverse plane in any given instant of time; for effecting the removal of the fuelresidue and coincidentally therewith supplying fresh material; for etficiently controlling and maintaining uniformity of the heat at the v'ariousstages or zones of extracting actionper unit of time; for maintaining a substantially constant action per. unit of time;'for maintaining a substantially constant maximum heat in the successive extracting zones through which thematerial by its progression is carried, thereby effecting a more rapid extraction action; for regulating-the removal'of fuel residue and the supply of fresh material according to the maximum temperature to which the extraction operation is carried on;

and for the use of low temperatures with all the resultant advantages thereof.

In the accompanying drawings 1 have shown an illustrative arrangement of apparatus embodying the principles of my in- .vention.

Referring to the accompanying drawings:- I

Fig. 1 is a view in side elevation somewhat 7 diagrammatic, illustrating a unit plant embodying the principles of my invention.

Fig. 2 is a view in vertical section on the line 2, 2, Figure 1, looking in the direction of the arrows.

Fig. 3 is a similar view on the line 3, 3, Fig. 2, looking in the direction of the arrows.

F ig. dis a view in horizontal section on the line 4:, 4:, Fig. 2, looking in the direction of the arrows. i i

Fig. 5 is a broken detail view in section on the same plane with Fig. 2, and on a somewhat larger scale,- showing the construction of a feed or discharge control gate employed in connection with my in vention.

Fig.6 is a similar view taken in a plane at right angles to Fig. 5.

Fig. 7 is a view somewhat enlarged show ing one end of the fuel residue discharge bar and its associated carriage.

Fig. 8 is an enlarged view in top plan, partsin section, parts broken, showing the connection of one end of the fuel residue ejector bar with its operating carriage.

" Fig. 9 is'a View in end elevation-of the construction shown in Fig. 8..

The same part is designated by the same reference numeral wherever the same V appears throughout the several views.

In the drawing I have shown a retort 10 carried by a suitable basell, both of which may be made of any suitable material and of the required dimensions. The inner walls 12 of the retort-or chamber are preferably inclined or tapered from the top or a point adjacent to the top downwardly so as to provide a chamber of gradually increasinginta rior area, thereby providing not only for the eflicient distribution and progression of the coal to be treated without clogging, but also permitting the proper expansion of the coal during the treatment.

In practice I have found that a retort and base composed of brick well answers the purpose, and for commercial operation the use of fire brick, particularly adjacent the base of the retort may be desirable. If desired, and as shown, the retort may be enclosed within sheet metal plates 13. Suitably built into or otherwise applied to the base 11 are beams 14 which extend across and beneath the base portion of the retort l0. Suitably supported upon a pair of these structure beams 14 are grate bars 15. These grate bars are constructed to-rest upon and be carried by the structure beams 14, and in suitably spaced relation with respect to each other, and constitute the base support for the fuel bed when the process of my invention is being carried out. Immediately below the fuel supporting grate bars is a hopper 16 having downwardly converging sides which termi nate in a central opening 17, which communicates with a discharging chamber 18 beneath said hopper 16. The communication between the hopper and the discharge chamber through the opening 17 is controlled in any suitable manner, as for example, by means of a sliding gate 19. The delivery from the discharging chamber is effected through an opening 20 in the bottom thereof which is controlled by a slidinggate 21.

Supported above the retort 10 is a receiving hopper 22 into which the coal to be treated is received. This hopper communicates through an opening 23' in its bottom with a receiving chamber 24, said communication being controlled inany suitable manner, as for example, by a sliding gate 25. The receiving chamber 24 delivers into the upper end of the retort 10 through an opening 26 in the bottom ofsaid receiving chamber 24 which is controlled in any suitable manner, as for example, by a sliding gate 27.

The several gates 19, 21, 25, 27, may be opcrated in any convenient manner. I have shown a simple arrangement wherein these several gates are of like construction, and therefore a description of' one will apply to all. Each gate is supported upon rollers 28 operating upon supporting tracks 29 carried 'by the inner side Walls of the casing of chambers 18, 24, respectively. Attached to each gate is a rack bar 30 designed to be engaged by a pinion 31 by means of which the gate may be shifted into position to cover or to uncover the communication which it controls. The pinions 31 may be operated in any suitable or convenient manner. As illustrative of one arrangement I have shown each pinion mounted upon a shaft 32 which is journaled in the side walls of the chain bers, to which shafts rotations may be imparted by any convenient means, such as cranks 33, although in practice the opera tion of the gates may be accomplishedautomatically.

In order to remove the fuel residue I employ an ejector bar 34 which,'in the particular form shown, comprises an I-beam and is disposed to extend through and to have its ends project beyond the working area of the extraction chamber 35 of the retort. This ejector bar is supported at its ends in carriages 36 having rollers 37 arranged to operate along tracks or rails 38 supported upon the structure beams 14. The ejector bar is disposed to operate immediately above and over the grate bars 15, and preferably, said ejector bar is disposed transversely to said grate bars to move laterally back and forth over the upper surfaces and in the direction of the lengths of said grate bars. Any suitable or convenient means may be employed to effect the back and forth movements of the ejector bar 34. In the particular form shown, to which, of course, the invention is not to be limited or restricted, feed screws 39 are arranged to engage screw blocks in the carriages 36. The screws 39 at the opposite ends of the ejector, bar aregeared as at 40 to a. drive shaft 41 which in turn is driven from any suitable or convenient source of power, as for example, through pulleysetQ.

The ends of thegrate bars, extend somewhat, beyond the interior area of the retort or extraction chamber 35 but terminate short; of the interior area of the hopper 16 leaving spaces 43. between the ends of the grate bars and the-sideWalls-of the hopper 16. The ejector bar 34 is traversed, in the action thereof, sufliciently far to clear the ends of the grate bars .or at least sufficiently far toejectthe-lowermost portions offuel residue over the ends-of the grate bars to permit or cause such residue to fall through the spaces as and into the; hopper l6-beneath. The traverse back and forth of the ejector bar 34; may betimedito suit; the character of the coal under treatment, or the character of the treatment to which the coal is subjected. By thisarrangement and with an ejector bar traversing back and forth rectilinearly across the lower end, of the retort or extracr tion chamber 35 I avoidone of the. serious objections heretofore experienced, particularly where an endless traveling belt is employed, namely, of crowding or pressingithe superposed coal or fuel continuously in the direction of movement-of the traveling belt, thereby causing variation in the density of the fuel bed or superposed material in horizontal-planes through the mass of material, and which variations in density of the mass result in inequalities in the fuel bed as well as in the heat generated'and in the extraction action to which the mass of material is subjected. By traversingvthe ejector bar back and forth across the lower end of the retort or extraction chamber 35 I am enabled to maintain a substantially uniform condition throughout the mass of fuel bed not only as to the degree of compressionor density thereof but also as. to the heat generr ationeffected therein, and hence I am enabled to maintain substantially uniform conditions of extraction action throughout all'points in any given plane through the mass of material parallel to the plane of action of the ejector bar, at any given instant of time, not only as. to the degree of heat generated and extracting action of'the heatedproducts and vapors, but also as to the progression of the mass of materials throughout the entire process, It is to be understood thatas'the fuel residue is ejected by the action of'the ejector barl3l4t at the lower portion of the fuel bedcorresponding freshqquantities of; fuel. material are admitted to the fuel bed and to the stack or pile under treatment at the upper end of the retort or extraction chamber. Toefiiciently-accomplishthis result the fresh material 'to be treated'is delivered; from the receiving hopper 22 with. the gate :25 open and the gate 27 closed so thatthe chamber 24 is; Jl. The gate 25. is then closedfand the gate/27 opened The mass of material contained in the chamber Qrests upon or forms in effect, the upper end of the stack or pile of material contained in the chamber At the same time the gate 19 of the discharge hopper is opened and the gate 21 is maintained closed. As the' action ofthe ejector bar 84 proceeds'the fuel residue is continuouslyejected, first over the ends of the grate bars 15 atone side of the fuel bed, and then over the oppositeends of the grate bars at theother side of the fuel bed. The fuel residue is collected in the hopper 16 and passes therefrom through the opening 17 into thedischarge chamber 18, the pile or stack of material in the chamber 35 being maintained in uniform volume by the replenishment thereof from the chamber 24 of fresh material as the fuel residue isejected at'the bottom of the pile or stack and to the extent to which. the fuel residue is ejected. The fuel is likewise and coincidently replenishedat the top from the coal in which the extraction action has been completed. When the discharge chamber 18 has become filled the gate 19 is closed and the gate 21 is opened so as to permit the fuel residue, which has collected in chamber 18 to discharge through the opening 20 from the discharge chamber 18, into any suitable car or other receptacle placed beneath .the chamber 18 to receive the same, and thence withdrawn through the doorway or opening 441- in the casing 45 within whicl the gates 19, 21, are arranged. Inlike manner when thereceiving chamber 24 has become exhausted. by the supply of the contents thereof to the mass of material under treatment in the retort or chamber.,35 the gate 27 is closed and the gate 25 opened so as to permit the receiving chamber 245 110 he again filled from the hop per 22 Thus it will be seen that by suit ably controlling the feed hopper and discharge hopper gates the feed of the material to, through andfrom the retort or extraction chamber 35 ismaintained substantially constant andthe progression of the mass of materialunder treatment is uniform at all points, all particles of the material in any given plan-enormal to. the direction of progressionof the material and parallel to the plane of action of the ejector bar being subjected. not only to the same degree of progression at any given instant of time but to inform heat conditions anduniform extraction action. a

It willbe understood, of course,.that at each traverse ofthe fuel residue ejector bar the portion of the fuel-bed which rests'upon i the grate bars is ejected, the superincumbent fuel beddescending by gravity to take the place of the ejected portion, and the mass of material resting on the fuel bed likewise descending in corresponding amount; into the upper part of the fuel bed. .This action will necessarily lower the, temperature not only of the fuel bed but also, throughout the entire retort chamber. This lowering of the temperature is comparatively slight, however, and of. short controllable duration since the fuel bed immediately builds up in. temperature, the draught therethrough being suitably controlled, until the desired maximum for extraction is again attained when the ejector bar; is again actuated in the opposite directionto efi'ect another removal of fuel residue, In this manner substantially uniform maximum extraction te1nperatures, as well as substantially uniform speed of progression of the material and of extraction action, are attained and maintained.

It is an important feature of my. inven-- tion that with such a condition of substantially continuous feed of raw material and ejection of fuel residue, .due to the removal of successive increments from the. bottom of the fuel bed and the replenishments, as above described, and with substantially uniform conditions of heat generation, of ex traction of progression of the material through the retort or extraction chamber, above explained, I am enabled to i'naintain a low maximum extracting temperature, for example, not. to exceed approximately below 800 F., which isbelow the cracking temperature of the oil product of extraction. This maximum extracting temperature is main tained at or in the region of the plane where the mass of material to he treats rests upon or merges into the fuel bed. At this point the extraction action has been practically complete-d. the volatiles driven off and collected. That is to say, the volatiles begin to be released from the material at the upper portion of the mass where the temperatm'e is quite low, and the extraction action continues under conditions of increasing tear perature and p essurc, duev to the nun-easing weight of the superincumbent materiai,.;as the material progresses through the chainber until. the point of maximum extracting temperature is reached, and this maximum extracting temperature, which as ahove stated, is about 80091 attained when the extracting action is completed and thematerial passes into the fuel bed zone Consequently I am enabled to effect the extraction and recovery of the oil content of the ma terial under treatment without effecting the chemical change in such products ofextraction resulting from the use of high or .oil cracking temperatures, and hence the products ofrecovery, accordingto my process, are more nearly of the nature of oil products rather than of tar products. I am thus also enabled to extract and recover an oil product which carries higher percentages of the more volatile constituents of the material to be treated, and which would be chemically changed by the higher temperatures ordinarily employed, and therefore which in former practice are recovered, if at all, only in comparatively small volumes, in the subsequent refining processes to which the oil and other extraction product may be subjected.

The ends of the ejector bar 3e extend into somewhat enlarged cup shaped recesses 51 in the carriages 36. This feature of structure permits the ejector bar to be easily inserted or removed for replacement or repairfin case of breakage or accident, without jam-- ming or choking the operation.

It is desirable, of course, to control the supply of air to the fuel bed according to the nature, quality or grade of material to be treated, the nature of the extraction action, the desired maximum temperature to be maintained, and the speed or timing of operation, in carrying out my invention. To accomplish this I propose to provide suitably controlled air openings indicated at 46 at convenient points below the fuel bed.

A delivery pipe connection l? extends into the retort or extraction chamber 35 at its upper end. A suitable suction pump 48 is connected to the pipe 47 and delivers irto an initial condensing chamber 49 from which the vapor and condensed products may pass through pipes 52, 50, respectively into and through the various refining and treating apparatus for further 'trc iirierit and refining, as may be desired, and which form no part of my presentinvr ion. By suitably regulating the suction action of the pump 48, and the area of opening of the air ports 46 any desired degree of draught may be maintained through the bed of material depending upon the nature or quality of the material under treatment, speed of operation desired, heat generation required, and extraction action. v

In order to start up the apparatus initially a fire is ignited on the grate bars 15 and the material to be treated is then introduced through the feed hopper 22 chamber 24 and into the chamber 35 so as to fill the latter. Th blower or pump 4:8 is put in operation and the air ports 46 regulated so as to cause the lowermost portion of the stack or pile of material contained in the chamber 85 to develop into a fuel bed. be heated products from the fuel bed are passed upwardly through the mass of material contained in the chamber 35 and eventually! are drawn off along with. the volatiles expelled thereby from the body of ma terial lying above the fuel bed. through the delivery pipe at? and pump 4:8 into the initial condensing tank or other desired receiving receptacle. In practice I have found it is desirable in this manner to build up a fuel bed approximately four feet in depth for efficient commercial 0 eration. I propose, in accordance with my invention to maintain a substantially constanttemperature not to exceed 800 F., at the upper surface of the fuel bed, as above explained. As the fuel bed attains the stage of fuel residue at the bottom of the bed the ejector bar 34 is put into operation and the lowermost portions of the fuel bed are successively expolled or ejected, first'by the movement of the ejector bar in one direction, and then by the movement of said bar in the other direction, the spent fuel or fuel residue being ejected ultimately over the respective ends of the grate bars and collected and removed as above described. The fused mass constituting the residue of fuel of the fuel bed is subjected, during this operation, not only to the pressure of the weight of superincumbent material but also to that of the pres sure bar in'itsejecting movement. This results in the production of a solidified residue or coke product of excellent commercial value in the case of such raw material as cannel coal. As the successive portions of the fuel bed are thus ejected their places are taken by successive. portions of fresh fuel by the descent by gravity of the mass of ma terial lying above the plane of action of the ejector bar. The material thus progresses through. the fuel bed in the same degree and at the same rate of progression throughout the entire mass of material under treatment, and the supply of fresh material at the top is controlled accordingly. The material tlius progressing or advancing substantially continuously through the retort or extraction chamber-is subjected to increasing degrees ofheat, starting .with the lowest tem peratures at the upper end of the stack or pile of material. and increasing therefrom until the desired maximum of extraction temperature is obtained when the material reaches the "stage where it passes into the fuel bed. During this action all of thevolatiles are drawn off from the coal. The maximum extracting temperature, as above stated, being below the cracking temperatures for oil, that'is, not exceeding, for example, about 800 F., in the case of coals of the class of higher volatiles, the extracted products are of the nature of oils instead of tar.

I have found that not only are the extraction products, accomplished by the use 'of the apparatus of my invention, of the nature of oil products rather than tar products, but also that because of the low temperatures employed, and other reasons, including the pressures .due to the weight of the material under. treatment and to the ejecting action of theejector bar, the carbon gases are not exhausted from the fuel residue, with the result that such residue, particularly in the case of coals of the higher volatile class, forms a valuable coke product, which is of greater heat value than the ordinary gas house coke. This is an especially important feature of my invention in that I am not only enabled to accomplish commercially, practically and successively the extraction of the oil contents 'of coal of the higher volatile class, such for example, as

commercial cannel coal, but I am enabled.

to produce from such treatment of this class of coals a coke product which possesses a higher fuel value than that of the commercial coke produced in methods at present employed in commercial practice.

It will be observed that the heat required is generated from and within the body of the material itself which is under treatment. I am therefore enabled to avoid the great expense and heat losses due to the use of outside sources of heat in carrying out the extraction operation. Where an outside source of heat is employed, and where extraction temperatures are required to be high, and are attained by conduction through the walls of the chamber in which extraction and recovery of the higher volatile constituents of carbonaceous material and I have found the above described apparatus particularly effective in recovering such higher volatile products such as tuluol, benzol, and the like, which are extracted or driven off from the fuel and delivered into the initial condenser along with the other volatiles, gases and vapors, and from which condenser the various gases, oils, and other products may be treated and refined according to anysuitable, convenient or preferred well known refining operations for the recovery and commercial utilization of such gases, toluol, benzol, oil, and other products.

It may sometimes be desirable to supplement the action of the fuel bed in generating the required extracting heat, and, in the case. of some varities of carbonaceous materials, such as shale, lignite, peat, and the like, to form and maintain the fuel bed within the body of the material under treat ment without effecting. combustion of the material itself. In such events I propose to employ suitable gas jets 60,,disposed within the base of the retort chamber at a plane immediately above the plane of action of the upper surface of theejector bar 3%, and preferably in close proximity to the inner wall of the extraction chamber. is many gas jets may be provided as required by the nature of the particular carbonaceous material employed. The heating may be supplied from any desired source. In practice, however, the gases given ofl dur ing the extraction operation furnishes an immediate available source of supply of the heating gas. In this event the gas is con ducted through suitable piping 61 from the gasometerGQ, into which. the evolved gases are eventually collected from the extracting operation. In this manner my invention is carried out even where the material to be treated is of such character that it does not ignite or furnish the required extracting heat directly in and by its own combustion.

lVhile I have shown and described a specific structure of apparatus suitable for carrying out my invention, it is to be understood that my invention may be carried out in a wide variety of specifically different structures of apparatus. I do not desire therefore to be limited or restricted, in the broad scope of my invention. to the specific structure shown and'described, nor'do I claim herein any method or process involved in the use of said apparatus, as the novel subject matter thereof is covered in a 001m panion application filed on even date herewith.

What I do claim herein as new and use ful, and of my oWn invention, and desire to secure by Letters Patent of the United States is 1. In an apparatus for treating carbonaceous material for the recovery of the volatile hydrocarbon constituents thereof, the combination with an internally tapered retort adapted to receive and contain the mass of material to be treated, a grate disposed at the base of the retort "to support the mass of material, means to maintain an ignited fuel bed in the base portion of the mass of material, means to control the temperature of such fuel bed, means connected to the top of the retort for supplying fresh quantities of the material to be treated, and means to withdraw the gases and vapors from a point at the top of the retort, of carriers respectively disposed at opposite sides of but outside the boundaries of the interior area of the retort, at the base thereof, an ejector bar operating over the grate and having its ends engaged by said carriers, and means'for periodically traversing said carriers 'baok and forth along the sides of the retort to remove successive increments ofthe residue of the fuel bed from the bottom thereof in opposite directions.

2. In an apparatus for treating carbonaceous material for the recovery of the volatile hydrocarbon constituents thereof, an internally tapered retort, a grate surface disposed in the base of said retort to form a support for a column of material contained in said retort, means to maintain an. ignited fuel bed in the base portion of the column of material above the grate surface and to control the temperature thereof, and means for drawing off the heated gases and vapor products from the top of the retort,.

in. combination with means to periodically remove in increments and successively in opposite directions the residue of the fuel bed from the bottom thereof above the grate surface, and means to simultaneously supply corresponding increments of fresh material into the top of the retort, whereby all particles of the material to be treated in any given plane normal to the line of progression of the material, are subjected to substantially uniform pressure and speed of progression.

In an apparatus for treating carbonaceous material for the recovery of the volatile hydrocarbon constituents thereof. an internally tapered retort adapted to receive and contain a column of material to be treated, means to maintain an ignited fuel bed in the base portion of the column of material, and at a temperature below that of destructive distillation of such material, and means connected to the top of the retort to draw off the heated gas and vapor products resulting from such fuel bed, in combination with means to periodically remove the residue of the fuel bed from the base thereof in successive increments in opposite directious, and means to coincidently supply corresponding increment-s of fresh material to the top of the retort. whereby all particles of the material to be treated in any given horizontal plane across the retort are subjected to substantially uniform pressure, temperature, and speed of progression.

4. In an apparatus for treating carbonaceous material for the recovery of the volatile hydrocarbon constituents thereof, a vertically disposed retort of increasing in ternal area from the top towards the bottom thereof, and adapted to receive and contain a column of the material to be treated, means to maintain an ignited fuel bed in the base portion of the column of material and at a temperature below the point of destructive distillation thereof, and means connected to the top of the retort to draw off the heated gas and vapor products, in combination with means to periodically withdraw successive increments of the fuel bed residue from the base thereof and means to simultaneously supply corresponding increments of fresh material into the top of the retort, whereby substantially continuous operation is carried on under substantially uniform conditions of temperature, pressure and speed of progression at all points in any given plane normal to'the line of progression.

5. In an apparatus for treating carbonaceous material for the recovery of the volatile hydrocarbon constituents thereof, a vertically disposed retort, a grate surface disposed in the base of said retort and forming a support for a column of the material. to be treated which is to fill said retort, means to maintain an ignited fuel bed in the base portion of the column material, and at a temperature below the point of destructive distillation of said material, and means connected to the top of the retort to draw off the heated gas and vapor products, in combination with track rails disposed at respectively opposite sides of the retort an d outside the interior thereof, carriers operating along said track rails, an ejector bar extending through the retort and operating upon the supporting surface of the grate, and having its ends extending beyond the interior area of the retort and engaging said carriers, means to progress said carriers back and forth along said track rails to cause said bar to remove successive increments of the residue of the fuel bed in opposite directions, and means to coincidently supply corresponding increments of fresh material into the upper end of the retort, whereby substantially continuous operation is carried on under substantially uniform conditions of temperature, pressure and speed of progression at all points in any given plane normal to the line of progression.

6. In an apparatus for treating carbo naceous material for the recovery of the volatile hydrocarbon constituents thereof, a vertically disposed retort, a grate surface disposed in the base of said retort and forming a support for a column of the material to be treated which is to fill said retort, means to maintain an ignited fuel bed in the base port-ion of the column of material, and at a temperature below the point of destructive distillation of said material, and means connected to the top of the retort to draw off the heated gas and vapor products, in combination with carriers disposed at respectively opposite sides of the retort, an ejector bar extending through the retort, and operating over the supporting surface of the grate and having its ends detachably engaging said carriers, means toprogress said carriers back and forth to cause said ejector bar to remove successive increments of the residue of the fuel bed in opposite direc tions, and means to coincidently supply corresponding increments of fresh material into the upper end of the retort, whereby substantially continuous operation is carried on under substantially uniform conditions of temperature, pressure and speed of progression at all points'in any given plane normal ,to the line of progression.

7. In an apparatus for treating carbonaceous material for the recovery of the hydrocarbon constituents thereof, a retort, a. stationary grate mounted in the base thereof and adapted to support a column of the material. to be treated which is to fill the retort, means to maintain an ignited fuel bed in the base portion of the column of material and at a temperature below the point of destructive distillation thereof, and means connected to the top of the retort to draw off the heated gas and vapor products, in combina tion with means to remove successively increments of the fuel bed residue from the base thereof, and means to supply corresponding increments of fresh material into the top of the retort.'

8. In an apparatus for treating carbonaceous material for the recovery of the hydrocarbon constituents thereof, a retort, a stationary grate mounted in the base thereof, and adapted to support a column of the material to be treated which is to fill the retort, means to maintain an ignited fuel bed in the base portion of the column of material and at a temperature below the point of destructive distillation thereof, and means connected to the top of the retort'to draw off the heated gas and vapor products, in combination with carriers disposed at respectively opposite sides of the retort, said carriers having elongated seats, an ejector bar extending through the retort and operating over said grate, the ends of said bar being received in said seats, means to traverse said carriers back and forth to cause said bar to remove the fuel bed residue in successive increments from the base thereof, and means to coincidently supply corresponding increments of fresh material into the top of the retort.

9. In an apparatus for treating carbonacous material for the recovery of the hydro carbon constituents thereof, a retort, a stationary grate mounted in the base thereof, and adapted to support a column of the material to be treated which is to fill the retort, means to maintain an ignited fuel bed in the base portion of the column of material and at a temperature below the point of destructive distillation thereof, and means connected to the top of the retort todraw off the heated gas and vapor products, in combination with carriers disposed at respectively opposite sides of the retort, said carriers having elongated seats, an ejector bar extending through the retort and operating over said grate, the ends of said bar being received in said seats, feed screws engaging said carriers to traverse the same back and forth to cause said bar to remove the fuel bed residue in successive increments from the base thereof, and means to coincidently supply corresponding increments of fresh material into the top of the retort.

10. In an apparatus for treating carbona ceous material for the recovery of the hydrocarbon constitutents thereof, a retort, a sta tionary grate mounted in the base thereof, and adapted to support a column of the material to be treated which is to fill the retort, means to maintain an ignited fuel bed in the base portion of the column of material and at a teniiperature below the point of destructive distillation thereof, and means connected to the'top of the retort to draw off the heated gas and vapor products, in combination with an ejector bar extending through the retort and operating over said grate, means detachably engaging the ends of said bar to traverse the same back and forth across the grate to remove the fuel bed residue in successive increments from the base thereof, and means to coincidently supply corresponding increments of fresh material into the top of the retort.

11. In an apparatus for treating carbonaceous material for the recovery of the hydro carbon constituents thereof, a retort, a stationary grate mounted in the base thereof and adapted to support a column of the material to be treated which is to fill the retort, means to maintain an ignited fuel bed in the base portion of the column of material and at a temperature below the point of destructive distillation thereof, and means connected to the top of the retort to draw off the heated gas and vapor products, in combination with means to remove successively increments of the fuel bed residue from the base thereof, a hopper disposed above the retort, a receiving chamber disposed between the hopper and the retort, and means to control the communications between the hopper and chamber, and the chamber and retort, to permit the supply of corresponding increments of the fresh material into the retort coincident-1y with the removal of the fuel bed residue without the admission of air therewith.

12. In an apparatus for treating carbonaceous material for the recovery of the hydrocarbon constituents thereof, a retort, a stationary grate mounted in the base thereof and adapted to support a column of the material to be treated which is to fill the retort, means to maintain an ignited fuel bed in the'base portion of the column of material and at a temperature below the point of destructive disillation thereof, and means connected to the top of the retort to draw off the heated gas and vapor products, in combination with means to periodically remove successively increments of the fuel bed residue from the base thereof, a discharge hopper disposed beneath the grate to receive the removed increments of fuel bed residue, a discharge chamber located beneath the discharge hopper, means to control the com munication between the discharge hopper and the discharge chamber, means to con trol the delivery opening of the discharge chamber and means to supply corresponding increments of fresh material into the retort coincidently with the removal of the fuel bed residue from the grate.

18. In an apparatus of the class described, a retort, a supporting grate for a column of material to be contained in and to fill said retort, means to establish and maintain a fuel bed in the base portion of the column of material, and at a temperature below the point of destructive distillation of such material, means to remove the fuel bed residue in successive lncrements from said grate,

and means to coincidently supply corre sponding amounts of fresh material into the top of the retort whereby substantially uni form conditions of temperature, pressure and speed of progression is maintained at all points in any given plane normal to the direction of progression, and means connected to the top of the retort to draw off the generated gas and vapor products.

In testimony whereof I have hereunto set my hand on this 4th day of April, A. D.

CHARLES C. BUSSEY. 

